BY ROWLAND E. TURNER. 225 



along anterior margin; median segment short, obliquely truncate 

 posteriorly. Abdomen almost smooth, with a few scattered 

 punctures on apical margin of fourth and fifth segments. First 

 segment vertically truncate anteriorly, the apical margin raised, 

 and a less prominent carina just before apex. Second segment 

 with four transverse carinee at some distance from apex, apical 

 area with two or three indistinct transverse striae, apical margin 

 very slightly raised. Fifth segment beneath coarsely longi- 

 tudinally striate-rugose. Pygidium truncate posteriorly, surface 

 of truncation smooth, narrow, elongate-oval; contracted before 

 truncation and marked with a series of carinee diverging towards 

 apex, narrowly A-shaped. 



Z/a&.— Swan River, W. A. (Smith). Allied to T. flavopictus Sm. 



178. T. agilis Sm. 



Thynnus agilis Sm., Cat. Hym. B.M. vii. p. 20, n.38, 1859(<J). 



g. Clypeus broadly subtruncate anteriorly, sparsely punctured; 

 head and thorax finely rugulose; scutellum punctured. Median 

 segment oblique, rounded at the sides, with thin grey pubescence. 

 Abdomen elongate, shallowly punctured, first segment oblique 

 anteriorly, with a groove between first and second segments 

 beneath; apical segment rugose. Hypopygium prominent near 

 basal angles, subtriangular, with a short apical spine. 



Hob.— Swan River, W.A.(Smith); Sydney, N.S. W.(Froggatt). 



179. T. assimilis Sm. 



Thynnus assimilis Sm., Cat. Hym. B.M. vii. p.20, n.37,1859( ( J). 



<J. Clypeus strongly punctured, broadly truncate anteriorly 

 and connected by a narrow carina with interantennal prominence. 

 Head very finely punctured, with a short arched carina above 

 anterior ocellus. Thorax finely punctured, scutellum shining, 

 narrowly truncate at apex. Median segment depressed, oblique, 

 rounded at sides. Abdomen closely and shallowly punctured, 

 first segment oblique at base, with a shallow groove between first 

 and second segments beneath; seventh longitudinally striated 

 18 



